package cn.always.xiajia.framework.security.core.handler;

import javax.servlet.FilterChain;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.http.MediaType;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.AuthenticationEntryPoint;
import org.springframework.security.web.access.ExceptionTranslationFilter;

import cn.always.xiajia.framework.common.exception.enums.GlobalErrorCodeConstants;
import cn.always.xiajia.framework.common.exception.util.ServiceExceptionUtil;
import cn.always.xiajia.framework.common.util.ExtServletUtil;
import cn.hutool.json.JSONUtil;
import lombok.extern.slf4j.Slf4j;

/**
 * 访问一个需要认证的 URL 资源，但是此时自己尚未认证（登录）的情况下，返回
 * {@link GlobalErrorCodeConstants#UNAUTHORIZED} 错误码，从而使前端重定向到登录页
 *
 * 补充：Spring Security 通过
 * {@link ExceptionTranslationFilter#sendStartAuthentication(HttpServletRequest, HttpServletResponse, FilterChain, AuthenticationException)}
 * 方法，调用当前类
 * 
 * @author xgj
 *
 */
@Slf4j
@SuppressWarnings("JavadocReference") // 忽略文档引用报错
public class AuthenticationEntryPointImpl implements AuthenticationEntryPoint {

	@Override
	public void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException e) {
		log.debug("[commence][访问 URL({}) 时，没有登录]", request.getRequestURI(), e);
		// 返回 401
		// 必须使用 APPLICATION_JSON_UTF8_VALUE，否则会乱码
		ExtServletUtil.write(response, JSONUtil.toJsonStr(ServiceExceptionUtil.exceptionF(GlobalErrorCodeConstants.UNAUTHORIZED)),
				MediaType.APPLICATION_JSON_UTF8_VALUE);
	}

}
